Equalizers have always been politically incorrect in high end, disapproved of. That's because the typical graphic equalizer is not very transparent, often causing a decrease in resolution and general SQ when inserted into a really good system. The filters in them often add phase shift and other artifacts to the signal, doing as much harm as good. But even before that, the theory behind them is flawed; an equalizer is often used to correct for problems that require acoustic solutions, not electronic.
But the current digital devices for room mode/bass problems (such as the Antimode Dual-Core by Gradient) are a different story. If used on a separate subwoofer, they offer substantial improvements with no penalty. The signal to the power amp and main loudspeakers does not pass through it, so is not digitized. Purist approved!